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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b612a6f1d2e8f852baf0852709889011f3771df95105fe090b7514d4d89fc6' 
  AND token = 'foFVCKJCT6kC8ov6C6/27lbKKghuydWga8qXkii+7oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}